Already before 2012 Randall began making references to Self-driving cars (the word he has used most often, and never autonomous cars as is the Wikipedia article title), and since then it has become a recurring theme, with comic 1720: Horses being the one that sparked the creation of this category. But already in 1559: Driving these kind of cars where the main cause of the pun, and also in 1493: Meeting where they a big part. In other comics they have just been mentioned.

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